APA (7th ed.) Citation

Chopin, F., Britten, B., & Fokine, M. (1950). Les Sylphides. Ballet Music.

Chicago Style (17th ed.) Citation

Chopin, Frédéric, Benjamin Britten, and Michel Fokine. Les Sylphides. New York: Ballet Music, 1950.

MLA (9th ed.) Citation

Chopin, Frédéric, et al. Les Sylphides. Ballet Music, 1950.